32results about How to "Flexible and reliable control" patented technology

The invention provides a water heater and a control method of the water heater. The water heater comprises a heat pump heating system and an electric heating system. The control method of the water heater comprises the steps of obtaining environmental parameters of the environment where the water heater is located; matching the environmental parameters with a plurality of preset execution conditions to obtain execution conditions matched with the environmental parameters; according to the matched execution conditions, determining control modes corresponding to the environmental parameters, wherein control parameters used for adjusting the running state of the heat pump heating system and / or the electric heating system are preset in the control modes; and according to the preset control parameters presetin the determined control modes, adjusting the running state of the heat pump heating system and / or the electric heating system. According to the scheme, the control modes corresponding to the environmental parameters are used for adjusting the running state of the water heater, and therefore the parameters can be flexibly controlled according to the specific use environment; and on one hand, the water using requirement of a user can be met, and on the other hand, work efficiency and use reliability of the water heater can be improved.

The invention provides a hybrid micro-grid system based on a virtual synchronous motor. The hybrid micro-grid system based on the virtual synchronous motor is characterized by comprising an alternating current subnet, a direct current subnet, a coupling converter unit, an alternating current load and a direct current load, wherein the alternating current load is connected with the alternating current subnet; the direct current load is connected with the direct current subnet; the coupling converter unit is connected with the alternating current subnet through an alternating current distribution bus; the coupling converter unit is connected with the direct current subnet through a direct current distribution bus; the alternating current subnet is connected with the alternating current distribution bus through an alternating current line impedor; and the direct current subnet is connected with the direct current distribution bus through a direct current line impedor. The invention provides a coordinated control method for the hybrid micro-grid system. According to the coordinated control method provided by the invention, the characteristics of reasonable optimized allocation of tidalcurrent of the alternating and direct current subnets, stable running regions, capacity limitation and the like are fully considered; the power utilization demands of different users can be adapted;and virtual inertia is provided to ensure system voltage / frequency stability.

The invention relates to a hydraulic control system for rotation of an excavator in order to solve the problem that energy overflow loss exists when an existing hydraulic excavator is started in a rotation mode. The hydraulic control system for rotation of the excavator comprises a rotary motor assembly, a main pump, a first three-position four-way solenoid directional valve, a main pump proportional electromagnetic valve, a main pump pressure sensor, a guide handle and a controller. A pump inlet of the main pump is connected with a port P of the first three-position four-way solenoid directional valve. A port A and a port B of the first three-position four-way solenoid directional valve are connected with a port A and a port B of the rotary motor assembly correspondingly. The control output end of the guide handle and the main pump pressure sensor are connected with the input end of the controller. The electromagnet control input end of the first three-position four-way solenoid directional valve is connected with the output end of the controller. The hydraulic control system for rotation of the excavator has the advantages that a small number of components are additionally arranged, the technology is relatively mature, the cost is low, an electronic control system and the hydraulic control system are combined, control is flexible and reliable, the energy utilization rate is high, the start overflow loss is reduced, and the energy saving effect is obvious.

The invention relates to a cleaning device for cleaning workpieces (106), comprising at least one workpiece receptacle (114) for a workpiece to be cleaned. The aim of the invention is to provide a simple, flexible and reliable verification of the position of the workpiece. To achieve this, the cleaning device comprises at least one distance sensor (126) that generates a signal, said signal being used to deduce whether a workpiece is held in the correct position in the workpiece receptacle.

The invention discloses a self-driving drive circuit of a double-tube forward synchronous rectification circuit. The double-tube forward synchronous rectification circuit includes a transformer, a double-tube forward network on the primary side of the transformer, and a synchronous rectification transformation network on the secondary side of the transformer. The transformer includes the first primary winding, the first secondary winding and the second secondary winding; the self-driving drive circuit of the double-tube forward synchronous rectification circuit is used to drive the freewheeling tube in the synchronous rectification transformation network, by controlling the self-driving Drive the working state of the first P-type MOS tube in the driving circuit to drive the rectifier tube in the synchronous rectification conversion network. The driving voltage provides a path for the output inductor of the subsequent stage, which can improve the efficiency of the converter. At the same time, the driving voltage of the freewheeling tube can be adjusted to make the control more flexible and reliable.

The invention discloses an automatic picking control method and a system of plate products, which can automatically pick the plate products off the line, and avoid disordered plates. The method comprises the following steps that: when a control unit receives a starting instruction sent by a user or once a second detecting unit detects the nonexistence of a lifting roll platform, controlling the lifting roll platform to be lifted to a highest allowable end, wherein the highest allowable end of the lifting roll platform is not higher than a roller conveyor; controlling the operation of the roller conveyor; when a first detecting unit detects the presence of a plate on the roller conveyor, sending a signal to the control unit: when the control unit receives the signal sent by the first detecting unit, after a given interval time, ordering the lifting roll platform to descend, wherein the given interval time needs to guarantee that after the plate is conveyed to the lifting roll platform,the lifting roll platform can descend; making sure that the descending height of the lifting roll platform is not smaller than the thickness of the plate; and when the second detecting unit detects that the lifting roll platform descends to a bottom end, stopping the off-line procedure by the control unit.

The invention is a current-equalizing pneumatic heat exchanging bed for a circulating fluidized bed boiler (CFBB), comprising a feed bin 1, a high-temperature bin 2, a current-equalizing bin 3, a heat exchanging bin 4, a low-temperature bin 5, a wind box 16 of each bin and the bottom part thereof, an air distributor 15, a hood 14, an air duct 18 and a wind speed control device 19 to form an independent and operable integral. The shunting ratio of circulating ash can be controlled by adjusting wind speed of each bin, part of circulating ash directly goes back to a furnace 20, and the other part thereof goes back to the furnace 20 after being cooled by a heating surface 6. The invention uses a pneumatic method for realizing shunting and controlling of the circulating ash, has the advantagesof wide adjusting range, evenly heat exchanging, no abrasion and tube explosion and mechanical fault, and is applicable to large-scale circulating fluidized bed boiler (CFBB).